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<p><strong>Reference</strong> &nbsp;  <a class='wikilink' href='index.html'>Language</a> | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='selflink' href='Changes.html'>Changes</a>
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<p class='vspace'></p><h2>Changes</h2>
<p>This page lists major changes to the Arduino core, libraries, and environment.  For details, see the <a class='wikilink' href='http://arduino.cc/en/Main/ReleaseNotes'>release notes</a>.
</p>
<p class='vspace'></p><h3>Changes in Arduino 1.0.1</h3>
<p><strong>Environment (IDE)</strong>
</p><ul><li>Internationalization of the IDE and translation into multiple languages (selected in preferences dialog).
</li><li>New preference for skipping verification during upload (for increased speed).
</li><li>Speeded up compilation by only compiling changed files.  (Except for the first compilation after selecting a new board, when all files are compiled.)
</li></ul><p class='vspace'></p><p><strong>Language (API)</strong>
</p><ul><li>Added support for the Arduino Leonardo.
</li><li>Added Leonardo-specific <a class='wikilink' href='MouseKeyboard.html'>Mouse and Keyboard libraries</a>.
</li><li>Added INPUT_PULLUP argument to <a class='wikilink' href='PinMode.html'>pinMode()</a> function.  The INPUT mode now explicitly disables the pullup resistors.
</li><li>Added ability to generate repeated starts in the Wire library (in master mode).  Extra boolean parameters to <a class='wikilink' href='WireEndTransmission.html'>endTransmission()</a> and <a class='wikilink' href='WireRequestFrom.html'>requestFrom()</a> control whether or not to send a stop (or a repeated start instead)
</li><li>Added <a class='wikilink' href='EthernetMaintain.html'>Ethernet.maintain()</a> function for renewing DHCP leases.
</li><li>Added readString() and readStringUntil() functions to Stream, Serial, etc.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 1.0</h3>
<p><strong>Environment (IDE)</strong>
</p><ul><li>New file extension (.ino).
</li><li>New toolbar icons: checkmark (verify) and arrow (upload).  (Nicholas Zambetti)
</li><li>New color scheme, document icon, about image (!<span class='wikiword'>ToDo</span>).
</li><li>Board name and serial port are shown in status line at the bottom of the editor. (from Wiring)
</li><li><span class='wikiword'>URLs</span> in the sketch code are now clickable hyperlinks (issue 148) (Christian Maglie)
</li><li>Progress bar shown during compilation and upload. (from Wiring)
</li><li>Support for uploading sketches from within the IDE: hold shift while clicking upload or select "Upload Using Programmer" from the File menu.  Select programmer from the Tools menu of the IDE.
</li><li>Verbose output (during compilation or uploading) now enabled from within the preferences dialog.
</li></ul><p class='vspace'></p><p><strong>Language (API)</strong>
</p><ul><li>Switching to non-blocking Serial writes with a transmit buffer.
</li><li><a class='wikilink' href='Serial_Flush.html'>Serial.flush()</a> now waits for transmission of outgoing data rather than discarding received incoming data.
</li><li>Reimplementation of the <a class='wikilink' href='SoftwareSerial.html'>SoftwareSerial library</a> to support multiple ports (!<span class='wikiword'>NewSoftSerial</span> by Mikal Hart).
</li><li>Removed Matrix and Sprite libraries.
</li><li><a class='wikilink' href='Serial_Print.html'>Serial.print(byte)</a> now prints the digits of the number as characters; use <a class='wikilink' href='Serial_Write.html'>write()</a> to send as a single byte.
</li><li><a class='wikilink' href='Serial_Write.html'>write()</a>, <a class='wikilink' href='Serial_Print.html'>print()</a>, and <a class='wikilink' href='Serial_Println.html'>println()</a> now return size_t (unsigned int) instead of void (issue 551): number of bytes written.
</li><li><a class='wikilink' href='Serial_Write.html'>write(str)</a> in Print is no longer virtual, so subclasses of Print or Stream can't (but also don't need to) override it.
</li><li>Added getWriteError(), clearWriteError(), and protected setWriteError() methods to Print; use to check for, clear, and set a write error flag.
</li><li>Removed the ability to say "client == NULL" or "client != NULL" from Ethernet library; use "if (client)" or "if (!client)" instead.
</li><li>Reimplementation of <a class='wikilink' href='StringObject.html'>String class</a> (Paul Stoffregen + additional modifications).
</li><li>Added support for Flash-based strings using the F("string") syntax.
</li><li>Added DHCP and DNS support to the <a class='wikilink' href='Ethernet.html'>Ethernet library</a> (integration by Adrian !<span class='wikiword'>McEwen</span>).
</li><li>Renamed Ethernet Client, Server, and UDP classes to <span class='wikiword'>EthernetClient</span>, <span class='wikiword'>EthernetServer</span>, and <span class='wikiword'>EthernetUDP</span> to allow for simultaneous use of other networking libraries.
</li><li>Modified UDP API:
<ul><li><a class='wikilink' href='EthernetUDPBeginPacket.html'>beginPacket()</a> / <a class='wikilink' href='EthernetUDPEndPacket.html'>endPacket()</a> for bracketing outgoing UDP packet construction
</li><li>Inheriting from Stream, using write(), print(), and println() for UDP packet construction
</li><li><a class='wikilink' href='EthernetUDPParsePacket.html'>parsePacket()</a> for parsing incoming packets (and checking if there is one)
</li><li>available(), read(), peek() for reading bytes of incoming packet
</li><li><a class='wikilink' href='EthernetUDPRemoteIP.html'>remoteIP()</a>, <a class='wikilink' href='EthernetUDPRemotePort.html'>remotePort()</a> for information about incoming packet
</li></ul></li><li>Addition of <a class='wikilink' href='EthernetIPAddress.html'>IPAddress</a> class (Adrian !<span class='wikiword'>McEwen</span>).
</li><li>Modified Wire library to inherit from Stream; i.e. to use read(), write(), print(), println(), etc.  Bracket calls to those functions with beginTransmission() and endTransmission().
</li><li>Adding support for multiple open files and directory iteration in <a class='wikilink' href='SD.html'>SD card library</a> (Limor Fried).
</li><li>Added <a class='wikilink' href='SerialEvent.html'>serialEvent()</a> function, called automatically on reception of serial data if it exists.  Also, serialEvent1(), serialEvent2(), and serialEvent3() on the Mega.
</li><li>Added <a class='wikilink' href='StreamFind.html'>find()</a>, <a class='wikilink' href='StreamFindUntil.html'>findUntil()</a>, <a class='wikilink' href='StreamParseInt.html'>parseInt()</a>, <a class='wikilink' href='StreamParseFloat.html'>parseFloat()</a>, <a class='wikilink' href='StreamReadBytes.html'>readBytes()</a>, <a class='wikilink' href='StreamReadBytesUntil.html'>readBytesUntil()</a>, and <a class='wikilink' href='StreamSetTimeout.html'>setTimeout()</a> to Stream (issue 458 - Michael Margolis).
</li><li>Updated Firmata to version 2.3 (r71): analog inputs now numbered from 14 (not 16) when used as digital pins.
</li></ul><p class='vspace'></p><p><strong>Internals</strong>
</p><ul><li>Renamed <span class='wikiword'>WProgram</span>.h to Arduino.h.
</li><li>Pin definitions separated from the core and stored in new variants/ sub-directory.  Specified by the _BOARD_.build.variant preference in boards.txt.
</li><li>Added macros / constants for getting information about the properties of the board (issue 490 and issue 495)
</li></ul><p class='vspace'></p><p><strong>Tools</strong>
</p><ul><li>Updated avrdude to 5.11 (and switched to arduino programmer type from stk500).
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0023</h3>
<h3>Changes in Arduino 0022</h3>
<h3>Changes in Arduino 0021</h3>
<h3>Changes in Arduino 0020</h3>
<h3>Changes in Arduino 0019</h3>
<ul><li>Added <a class='wikilink' href='StringObject.html'>String</a> class.
</li><li>Added <a class='wikilink' href='ShiftIn.html'>shiftIn()</a> function.
</li><li>Added <a class='wikilink' href='Serial_Peek.html'>Serial.peek()</a> function.
</li><li>Added aliases for the analog input pins: A0, A1, etc.
</li><li>Added <a class='wikilink' href='SPI.html'>SPI</a> library.
</li><li>Ethernet library now depends on the SPI library; add <code>#include &lt;SPI.h&gt;</code> to the top of sketches.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0018</h3>
<ul><li>Added <a class='wikilink' href='Tone.html'>tone()</a> and <a class='wikilink' href='NoTone.html'>noTone()</a> functions.
</li><li>Added <a class='wikilink' href='Serial_End.html'>Serial.end()</a> function.
</li><li>Added support for <a class='urllink' href='http://code.google.com/p/arduino/wiki/Platforms' rel='nofollow'>third-party hardware</a> in the hardware sub-directory of the Arduino sketchbook.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0017</h3>
<ul><li><strong>Environment</strong>: The code base for the Arduino development environment was largely re-written to bring it back into sync with Processing (1.0.3).  The main differences include support for multiple sketch windows open simultaneously and a dedicated window for the serial monitor.
<p class='vspace'></p></li><li><strong>Icons</strong>: The icons and about images were updated.
<p class='vspace'></p></li><li><strong>Arduino.app</strong>: The Mac OS X version of Arduino is now a .app file packaged in a .dmg.
<p class='vspace'></p></li><li><strong>Libraries</strong>: Support was added for third-party libraries in the <em>SKETCHBOOK</em>/libraries directory.  This allows user-installed libraries to persist across upgrades of the Arduino software.
<p class='vspace'></p></li><li><strong>Servo</strong>: The servo library was rewritten to allow support for up to 12 servos (on any pins) and up to 48 on the Mega.
<p class='vspace'></p></li><li><strong><span class='wikiword'>LiquidCrystal</span></strong>: The begin(), cursor(), noCursor(), blink(), noBlink(), display(), noDisplay(), scrollDisplayLeft(), scrollDisplayRight(), autoscroll(), noAutoscroll(), leftToRight(), rightToLeft(), and createChar() functions were added.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0016</h3>
<ul><li>New functions for writing a string, write(str), or buffer, write(buf, len), were added to the Print, Serial, and Ethernet library Client and Server classes.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0015</h3>
<ul><li>Support for the Arduino Mega.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0013</h3>
<ul><li>Support for printing floats was added to the Print, Serial, and Ethernet library Client and Server classes.
<p class='vspace'></p></li><li>The word type and word(), bitRead(), bitWrite(), bitSet(), bitClear(), bit(), lowByte(), and highByte() functions were added.
</li></ul><p class='vspace'></p><h3>Changes in Arduino 0012</h3>
<ul><li>Added the Firmata library, which provides a standard protocol for serial communication.
<p class='vspace'></p></li><li>Added Ethernet library.
<p class='vspace'></p></li><li>Added Servo library.
<p class='vspace'></p></li><li>Added <span class='wikiword'>LiquidCrystal</span> library.
</li></ul><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>.  Code samples in the reference are released into the public domain.
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